Rowlock.



No. 697,442. Patented Apr.. l5,` |902.

C. H. BUTTS.

BUWLDCK.

(Application filed Aug'. 7, 1901.)

(No Mode.)

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UNTTED STATES PATENT OEEICE.

CHARLES I-I. BUTTS, OF NORWICH, CONNECTICUT.

ROWLOCK.

SPECIFICATION formingpart of Letters Patent N0. 697,442, dated April1902.

Application iled August 7,1901. Serial No. 71,230. (No model.)

To @ZZ whom it may concer/7e:

Be it known that I, CHARLES H. BUTTS, a citizen ot' the United States,residing at Norwich, in the county ot' New London and State ofConnecticut, have invented certainnew and useful Improvements in.Rowlocks, of

which the followingis afull, clear, and exact has been providedheretofore.

The accompanying drawings illustrate the said improvements, Figure lbeing an elevation of a rowlock and a sectional view of itssupporting-socket, both embodying said improvements. In this view thepintle of the rowlock is shown seated in the socket ready In Fig. 2 Ihave shown the pintle removed from the socket.

In the drawings the letter ct denotes the horns of the rowlock, and bthesocket in which the pintle of the rowlock is supported, said pintlebeing peculiarly formed, as I will describe in detail. Said pintle isformed at its upper end-that is to say, immediately below the hornsa-with an enlarged portion a and with a reduced portion a2, upon whichlatter is formed one or more screw-threads a3. The largest diameter ofthe thread a3 is equal to the diameter of the enlargement ct', and thediameter at the bottom of said thread is equal to the diameter of thereduced portion a2 of the pintle, and the said thread is locatedsubstantially midway the length of said reduced portion, as seen in thedrawings. The socket b is formed at its upper end with an enlargedannular chamber b', adapted to receive the pintle enlargement a. andalso with asimilar annular chamber b2, adapted to serve as a chamber inwhich the pintle-threads a3 may revolve freely when the pintle andsocket are assembled for use. The lower end b3 of the socket-hole isreduced in diameter to provide a loose bearing for the end a? of thepintle, and immediately below the chamber b' the socket is formed withinternal threads b4, through which the pintle-threads a3 may be freelyscrewed.

In assembling the parts of my described device the pintle end is enteredin the sockethole and the threads a3 are screwed through thesocket-threads b4. The pintle then drops into the position shown in Fig.l ot the drawings, and the pintle-threads may then rotate freelylin thesocket-opening b2, the weight of the rowlock operating to keep thepintlethreads from so engaging the socket-threads as to unscrew thepintle from the socket.

It should be particularly noted that the described construction providesa substantial bearing at both the upper and lower ends of the pintle andthatthe screw-threads (both internal and external) are concealed andprotected, so that they cannot become jammed or otherwise mutilated byaccident, and thus become inoperative.

Inasmuch as the parts of my improved rowlock may be readily cast of ironor other suitable metal, they may be as cheaply produced as ordinaryrowlockshaving straight pintles.

Having thus described my invention, I claim- In combination, in arowlock, a pintle having an enlargement a and threaded portion b5, and asocket formed with upper and lower bearings for said pintle, as setforth, also with internal threads b4 and with an annular chamber b2 thatis above the lower bearing Signed at Norwich, Connecticut, this 25th dayof July, 1901.

CHARLES H. BUTTS.

Witnesses:

FRANK H. ALLEN, MAY F. RITCHIE. A

